Hi Omar.   I implemented AD Authentication recently on my MX84. It must be the sAMAccountName.   I searched a while about that. I don't remember where i found the answer but on this page you can see than the MX search by their sAMAccountName.   Regards,   Jimmy.   https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Active_Directory_Issue_Resolution_Guide   If the bind is successful, the MX/MR searches the directory for the user logging in by their sAMAccountName attribute. If a match is found, the DN of the user is returned to the MX/MR.     ... View more

You can't do that.   You would need to use something like RADIUS (such as NPS).  You could then configure local accounts on the NPS server as well as using AD. ... View more